This is a note to let you know that I've just added the patch titled
mm/memory_hotplug: fix memmap_on_memory sysfs value retrieval
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-memory_hotplug-fix-memmap_on_memory-sysfs-value-retrieval.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 11684134140bb708b6e6de969a060535630b1b53 Mon Sep 17 00:00:00 2001
From: Sumanth Korikkar <sumanthk@xxxxxxxxxxxxx>
Date: Wed, 10 Jan 2024 15:01:27 +0100
Subject: mm/memory_hotplug: fix memmap_on_memory sysfs value retrieval
From: Sumanth Korikkar <sumanthk@xxxxxxxxxxxxx>
commit 11684134140bb708b6e6de969a060535630b1b53 upstream.
set_memmap_mode() stores the kernel parameter memmap mode as an integer.
However, the get_memmap_mode() function utilizes param_get_bool() to fetch
the value as a boolean, leading to potential endianness issue. On
Big-endian architectures, the memmap_on_memory is consistently displayed
as 'N' regardless of its actual status.
To address this endianness problem, the solution involves obtaining the
mode as an integer. This adjustment ensures the proper display of the
memmap_on_memory parameter, presenting it as one of the following options:
Force, Y, or N.
Link: https://lkml.kernel.org/r/20240110140127.241451-1-sumanthk@xxxxxxxxxxxxx
Fixes: 2d1f649c7c08 ("mm/memory_hotplug: support memmap_on_memory when memmap is not aligned to pageblocks")
Signed-off-by: Sumanth Korikkar <sumanthk@xxxxxxxxxxxxx>
Suggested-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [6.6+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/memory_hotplug.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index b3c0ff52bb72..21890994c1d3 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -101,9 +101,11 @@ static int set_memmap_mode(const char *val, const struct kernel_param *kp)
static int get_memmap_mode(char *buffer, const struct kernel_param *kp)
{
- if (*((int *)kp->arg) == MEMMAP_ON_MEMORY_FORCE)
- return sprintf(buffer, "force\n");
- return param_get_bool(buffer, kp);
+ int mode = *((int *)kp->arg);
+
+ if (mode == MEMMAP_ON_MEMORY_FORCE)
+ return sprintf(buffer, "force\n");
+ return sprintf(buffer, "%c\n", mode ? 'Y' : 'N');
}
static const struct kernel_param_ops memmap_mode_ops = {
--
2.43.0
Patches currently in stable-queue which might be from sumanthk@xxxxxxxxxxxxx are
queue-6.6/mm-memory_hotplug-fix-memmap_on_memory-sysfs-value-retrieval.patch
